/*!
 * @file shader_data.h
 * @brief Definition of the Shader rendering class
*/

#ifndef _SHADER_DATA_H
#define _SHADER_DATA_H

#include "base_object.h"

#include "glincl.h"
#include <vector>
#include "count_pointer.h"

// FORWARD DECLARATION



//! The ShaderData is a Class-wrapper around the OpenGL Shader Language (GLSL).
class ShaderData : public BaseObject
{
  ObjectListDeclaration(ShaderData);
  //! The Type of Shader.
  typedef enum  {
    None       = 0,     //!< No Type at all
    Fragment   = 1,     //!< Fragment Shader.
    Vertex     = 2,     //!< Vertex Shader.
    Program    = 4,     //!< Compiled Shader Programm.
  }  Type;

 public:
  typedef CountPointer<ShaderData> Pointer;
public:
  ShaderData();
  virtual ~ShaderData();

  bool load(const std::string& vertexShaderFile = "", const std::string& fragmentShaderFile = "");


  GLhandleARB getProgram() const { return this->shaderProgram; }
  GLhandleARB getVertexS() const { return this->vertexShader; }
  GLhandleARB getFragmentS() const { return this->fragmentShader; }

  void activateShader();

  void debug() const;
private:
  void bindShader(const char* name, const float* value, size_t size);
  void linkShaderProgram();
  bool readShader(const std::string& fileName, std::string& output);
  bool loadShaderProgramm(ShaderData::Type type, const std::string& fileName);
  void deleteProgram(ShaderData::Type type);

  static void printError(GLhandleARB program);

private:

  std::string            fragmentShaderFile;
  std::string            vertexShaderFile;

  GLhandleARB            shaderProgram;

  GLhandleARB            vertexShader;
  GLhandleARB            fragmentShader;
};

#endif /* _SHADER_DATA_H */